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US 5,592,838 AGranted
Anti-attack interlocks for a combination lock mechanism
AssigneeMas-Hamilton Group
InventorsThomas R. Clark, Gerald L. Dawson, Paul T. Scherer
Life of this patent
Estimating the term…
Abstract
Interlocks are described that prevent the bolt of a bolt lock from being displaced to the unlocked position by the use of impact and inertial of the lock parts, heat and the displacement of the cover plate of the lock housing.
Claims15
An interlock comprising:
- a bolt having two positions, one of said positions being an extended position and another of said positions being a withdrawn position;
- a linkage connected to said bolt for transmitting force to said bolt to move said bolt from one of said positions to said other of said positions, said linkage having two positions relative to said bolt, one of said positions being a position ineffective to receive said force and said other of said positions being a position effective to receive said force;
- bolt moving means for providing said linkage said force to move said bolt;
- an interposer for displacing said linkage from said ineffective position to said effective position, said linkage disengageable from said interposer only upon movement of said linkage and said bolt to said withdrawn position;
- means for manually inputting a force to said lock;
- a rotary member rotationally driven by said means for manually inputting a force to transmit said input force to said interposer;
- electromagnetic means for selectively connecting said means for manually inputting a force to said rotary member;
- a displaceable blocking member for preventing said interposer from displacing said linkage, said displaceable blocking member directly blockingly engageable with said interposer to block said interposer from movement and displaceable by said rotary member to a position out of engagement with said interposer;
- said blocking member further comprises displacing means for moving said blocking member out of engagement with said interposer.
6 more elements
A lock having an anti-attack interlock comprising:
- a bolt having two positions, one of said positions being an extended position and another one of said positions being a withdrawn position;
- a linkage connected to said bolt for transmitting force to said bolt to move said bolt from one of said positions to said other of said positions, said linkage having two positions relative to said bolt, one of said positions being a position ineffective to receive said force and another of said positions being a position effective to receive said force;
- an interposer slidably disposed to transmit a driving force to said linkage to displace said linkage between said ineffective and effective positions;
- a manual force input selectively drivingly connectable with a cam;
- said cam disposed to slidably translate said interposer from said ineffective position to said effective position responsive to said manual force input;
- a displaceable blocking member disposable in a blocking relation to and directly engageable with said interposer to prevent said interposer from permitting displacement of said linkage and removable from blocking relation to said interposer in response to rotation of said cam, upon said lock being selectively conditioned to be opened;
- an electromagnetic means for controlling said interposer, wherein said blocking means comprises a pin;
- said pin selectively driven from a blocking relation to a position removed from a blocking relation to said interposer responsive to electromagnetic means, said electromagnetic means comprises a stepper motor, said said electromagnetic means for controlling said interposer further comprising a gear engageable with said manual force input and having a secondary driving connection to said cam.
5 more elements
Dependencies are inferred from the claim text.